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Sensors 2018, 18(11), 3884;

Optimized Gateway Placement for Interference Cancellation in Transmit-Only LPWA Networks

School of Electronic and Information Engineering Beijing Jiaotong University, Beijing 100044, China
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta 30332-0250, GA, USA
Department of Electrical Engineering Stanford University, Stanford 94305-2004, CA, USA
Author to whom correspondence should be addressed.
Received: 17 September 2018 / Revised: 29 October 2018 / Accepted: 3 November 2018 / Published: 11 November 2018
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We study the placement of gateways in a low-power wide-area sensor network, when the gateways perform interference cancellation and when the model of the residual error of interference cancellation is proportional to the power of the packet being canceled. For the case of two sensor nodes sending packets that collide, by which we mean overlap in time, we deduce a symmetric two-crescent region wherein a gateway can decode both collided packets. For a large network of many sensors and multiple gateways, we propose two greedy algorithms to optimize the locations of the gateways. Simulation results show that the gateway placements by our algorithms achieve lower average contention, which means higher packet delivery ratio in the same conditions, than when gateways are naively placed, for several area distributions of sensors. View Full-Text
Keywords: wireless sensor network; interference cancellation; capture; gateways location wireless sensor network; interference cancellation; capture; gateways location

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Tian, H.; Weitnauer, M.A.; Nyengele, G. Optimized Gateway Placement for Interference Cancellation in Transmit-Only LPWA Networks. Sensors 2018, 18, 3884.

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